This Whirlpool has a freezer section that is at 50 F, and a fridge section that is at 50 F. It seems to be running all the time.
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=ED5GHGXMQ00
The fresh food side gets it’s cooling from the freezer side that is why they are at the same temperature.
Remove the cover from inside the freezer so you can see the evaporator coils.
If they are heavily frosted/iced over then you have a defrost problem.
This is probably fixable at a reasonable cost.
If there is no frost on them or there is just frost in one area (usually where the freon enters the coils).
No frost will be either you are out of freon, the compressor is toast or there is a plug in the sealed system.
Frost in one area is usually a low freon indication.
Both the above conditions will be an expensive repair with no guarantee that it can be fixed. Often it is advisable to put those dollars towards a new unit.
I am assuming that you are correct that the compressor is running all the time other than perhaps when it goes through a defrost cycle.
Here is a good site with basic fridge info.
http://www.applianceaid.com/refrigerator.html
Check out 20.